windows 8 screen shutting off too soon

This was way trickier than I expected. You need to alter one registry value:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\7516b95f-f776-4464-8c53-06167f40cc99\8EC4B3A5-6868-48c2-BE75-4F3044BE88A7]\Attributes

Value Data = 2 (0x00000002)

After that, go back to your power settings in "Power Options" - "Advanced Power Settings". Now go to the "Display" item and a new option appears. It says "Console lock display off timeout" set this value and everything will be good.